The Bun.main property contains the absolute path to the current entrypoint.

console.log(Bun.main);

import "./foo.ts";

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The printed path corresponds to the file that is executed with bun run.

bun run index.ts

/path/to/index.ts

bun run foo.ts

/path/to/foo.ts

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See Docs > API > Utils for more useful utilities.